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Finding the Fourth Proportional to 7,856.70, 10,840.05 and 4,872.66

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Solution

The fourth proportional to 7,856.70, 10,840.05 and 4,872.66 is: 6,722.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,856.70 : 10,840.05 = 4,872.66 : x
  2. Step 2: Convert to fraction form
    7,856.70/10,840.05 = 4,872.66/x
  3. Step 3: Cross multiply
    7,856.70x = 10,840.05 × 4,872.66
  4. Step 4: Simplify right side
    7,856.70x = 52,819,878.03
  5. Step 5: Solve for x
    x = 52,819,878.03/7,856.70
  6. Step 6: Final answer
    x = 6,722.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.